Bracket Car Wiring Help

I have a 100a relay that is triggered by a switched on that powers a 6 circuit fuse block on my apron. Its protected by an 80 breaker.
I did not want to have to go back in to my harness if I decided to add something later.
I understand. There is no factory harness or any other wiring in my car. So I have the painless box with relayed circuits to run the car. I planned to power it and the MSD box through the hot side of the solenoid with a 100 amp fuse in between.